CP/M: Architecture, Legacy, and the Rise of PC Software

Analysis of Control Program for Microcomputers (CP/M), detailing its development by Gary Kildall and his wife, Dorothy McEwen Kildall, through their company, Digital Research. The text explores the operating system's revolutionary three-part architecture—the CCP, BDOS, and the crucial, hardware-abstracting BIOS—which established the first standardized software platform for microcomputers, fostering the market for independent software like WordStar and SuperCalc. Crucially, the source investigates CP/M's eventual loss of market dominance to MS-DOS, attributing the defeat not to a single missed meeting but to a catastrophic pricing error that allowed Microsoft to win the platform war. Finally, it confirms that MS-DOS functioned as an architectural clone of CP/M and notes that the original CP/M source code was recently released under a permissive license, sustaining its legacy in modern retro-computing communities.